"There was no thought behind it at all other than that I always knew she was going to be the godmother if I had another baby. It's because she's incredibly thoughtful," King told Elle. "Choosing a godmother is a very sacred and important thing in our family. They're going to be guiding your child, and they're responsible for them if something was to ever happen."

And Swift had many of the attributes King was looking for in that special someone. "We try and choose people who we know would raise our child the way that we would raise our child and her thoughtfulness, her kindness, her authenticity--the way that she's generous with her family, with her friends, with her fans--is so powerful to me," she said. "She's so uninhibited in her giving--the presents she gives to her fans, she wraps every single one, she paints the stuff. It's all her. It's just beyond. She's so clear with what it is that she wants to do yet at the same time she leaves herself so vulnerable. It is really powerful to me. That's why I feel like she's going to be the perfect godmother."

For those wondering how she popped the question to Swift, King recalled just what went down she proposed her pal be her kid's godmother.

"We were hanging out on the couch and I was like, 'Hey, would ever want to be a godmother?' And she was like, 'Uh, yes!'" King shared. "And she cried and, you know, all the fun things that best friends do."

King also dished all about the Instagram announcement in which Swift rubbed King's baby bump.

"We were just taking those pictures because we hadn't seen each other in a couple weeks, and she wanted to see my belly," she said. "So we took those pictures. Then we're like, 'Oh my god, that would be a really cute way to tell people she's the godmother. You know?' But literally we did it within two minutes. It's all just really in the moment."